JPH0257039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention makes it possible to write by making the lead of the ballpoint pen appear and disappear only by expanding and contracting the shaft of the ballpoint pen, making it convenient to store in a pocket when not in use, and at the same time making it convenient to store in a pocket when not in use. This is intended to simplify the process.

The present invention will be described in detail with reference to the illustrated embodiment. The front shaft portion 1 and the rear shaft portion 2 are slidably fitted to the front shaft portion 1.
As a result, the tip barrel portion 1 includes a cylindrical tip barrel body 3, a cap 4 screwed onto the tip of the tip barrel body 3, and a sliding thread 7 between the cap 4 and the rear collar portion 6. A sliding tip 5 that is movably inserted, a core tube 9 that is fixed to the rear part of the tip shaft body 3 and has a length that is inserted up to the intermediate stopper part 8 of the sliding tip 5, and a permanent magnet 10 that protrudes rearward.
A front shaft crown 12 having a fitting recess 11 with a
and an insertion hole 13 provided on the front and rear surfaces of the front shaft crown 12.
Insert the tip so that it can move freely back and forth, and the tip is the sliding tip 5.
It consists of a push rod 14 which can freely press against the rear flange 6 of the holder.

The joint part 15 between the front shaft part 1 and the rear shaft part 2 has stopper protrusions 16 and 16' provided around the rear part of the front shaft main body 3, and a stopper part 17 which is tapered at the tip of the rear shaft main body 19, which will be described later. It is made so that it hits against the wall and does not come off.

The core tube 9 is fitted into the insertion portion 12' of the tip crown 12, and a ballpoint pen refill 18 can be freely inserted into the core tube 9. The top surface of the magnet 10 is made not to protrude beyond the fitting recess 11, and a gap is provided between the magnet 10 and the fitting recess 11.

The rear shaft portion 2 includes a rear shaft main body 19 and a rear shaft crown 2 in which a magnetic body 20 magnetically attached to the permanent magnet 10 is installed.
When the rear shaft main body 19 is pushed into the front shaft main body 3, the permanent magnet 10 magnetically attaches to the magnetic body 20 against the spring 7, and at the same time, the rear end of the push rod 14 hits the rear shaft crown 21. The push rod 14 is pushed by hitting the button.

In the figure, 22 is a clip. Reference numeral 23 denotes a running groove provided on the side of the magnet 10 so that the push rod 13 runs (this may not be necessary depending on the size of the magnet).

The distance between the base 5 and the rear flange 6 of the sliding tip 4, the length of the push rod 14, the permanent magnet 10 and the magnetic body 20
The distance between them, the length of the ballpoint refill 18, etc. are determined based on their relative relationship.

The present invention is realized as described above, and in order to use the present invention, from the contracted state shown in FIG. 1 to the extended state shown in FIG. By releasing the magnetization of the body 20, the pressure of the push rod 14 is released, and the sliding tip 5 is retracted inward by the spring 7, and at the same time, the tip of the ballpoint refill 18 is exposed, and the pen is in a writing state. At this time, the tip of the core tube 9 is hooked to the intermediate stopper portion 8 of the sliding tip 5. Further, by pulling the rear shaft main body 19 rearward to the limit, it becomes elongated, and the push rod 14 is released from the sliding tip 5 and the rear shaft crown 21. The inner surface of the rear axle main body 19 is connected to the stopper protrusions 16, 16' of the front axle main body 3.
It is designed so that it does not shrink inadvertently due to sliding contact.

To change the state from the extended state shown in FIG. 2 to the contracted state shown in FIG. The moving tip 5 is pushed forward against the spring 7 to hide the tip of the ballpoint refill 18, and at the same time, the permanent magnet 10 and the magnetic body 20 are attracted and magnetically attached to each other, and the whole is contracted and stored. At this time, the pressure between the core tube 9 and the intermediate stopper part 8 is released, but since the push rod 14 presses the sliding tip 5, the sliding tip 5 is not pulled inward.

As described above, the present invention consists of a tip shaft portion, a rear shaft portion that is slidably fitted into the tip shaft portion and can be freely adjusted for expansion and contraction, and the tip shaft portion includes a tip shaft body to which a base is screwed, A ballpoint pen refill is inserted into and removably inserted into a core cylinder installed in the tip shaft body, and the tip of the ballpoint pen refill is inserted into the base so that the tip of the ballpoint protrudes from the base, and a spring is inserted between the ballpoint pen refill and the base. a sliding tip that can be freely protruded to a position where it is concealed; a push rod that protrudes behind the tip shank and can press the sliding tip against the spring;
It consists of an insertion part into which the core tube is inserted, and a front shaft crown that protrudes rearward of the front shaft body and has a fitting recess with a permanent magnet inside the bottom part, and the rear shaft part has a magnetic body and a rear shaft part. The push rod can press the sliding tip by pushing the rear shaft body into the front shaft body, and the magnetic material of the rear shaft crown can push the front shaft in the pushed-in position. Since it can be magnetically attached to the permanent magnet of the main body, the tip of the ballpoint refill can be made to appear and disappear by simply pushing the rear shaft main body and pulling it backwards, making writing work or storage work smooth and compact. In some cases, the tip of the ballpoint pen refill will not inadvertently protrude beyond the tip of the sliding nib, so there is no risk of staining your pocket, etc., and even if you store it in the shallow bottom of a pocket such as a dress shirt, the clip will not stick out. Since it is fully hooked to the rim of the mouth, it will not fall off accidentally.

In addition, since the tip of the ballpoint pen refill protrudes before the rear shaft reaches its limit, it is convenient to write with the tip shortened or lengthened as appropriate when in use. Also, there is no influence of permanent magnets on the outer periphery of the rear shaft body, allowing comfortable writing.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the ballpoint pen of the present invention when it is retracted, and FIG. 2 is a cross-sectional view when it is expanded. 1 is the front shaft part, 2 is the rear shaft part, 3 is the front shaft body, 4 is the base, 5 is the sliding tip metal, 7 is the spring, 9 is the core tube, 10
is a permanent magnet, 11 is a tip crown, 14 is a push rod, 18
is a ballpoint refill, 20 is a magnetic material, and 21 is a rear crown.

Claims (1)

[Claims] 1 Consists of a tip shaft portion and a rear shaft portion that is slidably fitted into the tip shaft portion and can be freely adjusted for expansion and contraction; A ballpoint pen refill that is removably inserted into a core tube and has a tip protruding from the cap, and a spring that is interposed between the ballpoint pen refill and the cap and protrudes to a position where the tip of the ballpoint pen refill is hidden. A sliding tip that is free to move, a push rod that protrudes to the rear of the tip shaft portion and that can press the sliding tip against the spring, an insertion portion into which the core tube is inserted, and a bottom that projects to the rear of the tip shaft body. It consists of a front shaft crown with a fitting recess with a permanent magnet inside.
The rear shaft part consists of the rear shaft main body and a rear shaft crown in which a magnetic material is installed, and the push rod can freely press the sliding tip by pushing the rear shaft main body into the front shaft body, and The magnetic material on the top of the crown is a retractable ballpoint pen that can be freely attached to the permanent magnet in the tip of the barrel in the closed position.